Drill jig



Feb. 18, 1958 N. LENTINO ETAL DRILL JIG Filed April 50, 1956 NTINO United States Patent DRILL JIG Nelson Lentino, Astoria, and John Curran, Long Island City, N. Y.

Application April 30,1956, Serial No. 581,512

4 Claims. (Cl. 77 -62) The presentinvention relates toadrill jig and in particular to a jig adapted for the drilling ,of. holes in rods orthe like.

Jigs serving substantially the same purpose have been proposedbeforewhich were, however, notonly of rather complicated and, therefore, expensive structure, but also required clamping or similar means in order to combine a base block 'with a body block in proper relative position.

It is, therefore, one object of the present invention to provide an improved jig which is of particularly simple construction and which is adapted to accommodate a plurality of sizes of rod, shafts or the like for drilling.

It is another object of the present inventionto provide a drill jig having indicating means thereon whereby a length of the rodmaybe-accurately measured for drilling a ,hole at a predetermined distance; from the extremities thereof.

It is a still further object of the present invention to provide a drill jig which is sturdy and of durable construction, reliable and efficient in operation, and comparatively simple and inexpensive to manufacture and assemble.

With these and other objects in view which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawing, in which:

Figure 1 is a perspective front view of the drill jig;

Fig. 2 is a front perspective view of the drill jig with a rod shown in operative position;

Fig. 3 is an end view showing the base block with the shoulder plates attached to it, and in dotted lines a reversed position of the jig member;

Fig. 4 is a section along the lines 4-4 of Fig. 2;

Fig. 5 is a section along the lines 5-5 of Fig. 4; and

Fig. 6 is a fragmentary section along the lines 6-6 of Fig. 2.

Referring now to the drawings, the drill jig comprises a base block 1, consisting of an elongated block member which is equipped on its top face with a V-shaped groove 2.

The base block 1 is equipped with a vertically disposed bore 3 which leads into a counter-bore 3', the axis of which forms a right angle to the V-shaped groove 2 and is spaced apart from one of the end faces at a predetermined distance therefrom.

The side faces of the base block 1 have secured thereto shoulder plates 4 by means of screw bolts 5 or any other suitable means. Each of the shoulder plates 4 may be substantially of U-shape, the base 6 of the U engaging firmly the side face 7, while the upwardly projecting leg members 8 and 9 of the shoulder plates 4 are slightly inclined towards each other, as shown in Fig. 3 of the drawing on an exaggerated scale, merely for the purpose of better demonstration. It is essential, however, that the shoulders permit a required degree of resiliency regardless of its shape. One of the leg members has a flange extension 10' projecting substantially perpendicu- 2,823,564 Patented Feb. 18, 1958 larly therefrom for a purpose to be described later. Due to the fact'thatthe leg members 8 and 9 are bent slightly inwardly towards each other, these leg members lend themselves to be spread resiliently in outward direction and to exert a clamping action on a member inserted therein.

The flange extension 10' is of importance for the jig member 10 which has projecting from itsbottom face 11 a V-shaped projection 12 extending longitudinally therethrough. The jig-member is adapted-to be inserted between the leg members 8' and 9 on top of'the'base blocktl with the V-shaped projection 12 disposed oppositethe V-shaped groove 2, as shown in Figs. 1 and 2, or in :re- Versed position, as shown in dotted lines in Fig. '3, the latter being preferably used in connection withrods of larger crosssection. The previously mentioned resiliency of the leg members 8 and 9 retain the jig 'member'in any desirable position vertically spaced apart from the base block 1.

The jig member 10 is equipped with a vertically disposed bore 13 which is adapted to receive exchangeable bushings 14 having diiferent inner bores 15 depending upon the diameter of the drill bit 16 to be inserted into the. bore 15 of the bushing 14. The counter-bore 3 is adapted to receive the lower'end ofthebushing 14 ifrods ofasmall cross section .are worked on.

.In order to mount the jig member 10 on top of the base block 1, the former slides preferably longitudinally be tween'the leg members 8 and 9 until the end face 17 of the jig member 10 abuts against the-flange extension 10 inwhich position the axis ofithe bore 13 of the: jig member '10: is exactlyaligned with :the axis of the bore 3 of the base block:1.

Extending from the end face 17 is provided a threaded bore 18 which is adapted to receive a set screw 19 in order to retain the bushing 14 in the bore 13.

The base block 1 has extending therethrough longitudinally a cylindrical bore 20 which is adapted to receive a rod 21 which is graduated in terms of inches in fractions thereof and the end of which is bent over perpendicularly therefrom to form an abutment member 22 designed to engage the end face of the workpiece 23 which is to be drilled. By withdrawing and inserting, respectively, the rod 21 from and into the base block 1, the workpiece 23 may be set in the groove 2 of the base block 1 in such manner that the hole to be drilled therethrough is at a predetermined distance from the end face of the workpiece 23. One of the side faces 7 of the base block 1 has a crosswise disposed threaded bore 24 which is adapted to receive a set screw 25 which engages the rod 21 and retains the latter in any predetermined position set in accordance with the graduation provided thereon.

From the foregoing description of the drill jig, the operation of the device will be quite apparent. A workpiece 23 is mounted on the base block 1 by resting the work piece 23 in the groove 2 of the base block 1. The workpiece is then longitudinally adjusted until its end face abuts the abutment member 22 of the rod 21, the latter being set by means of its graduation in accordance with the distance at which the hole to be drilled is required in the workpiece 23. The jig member 10 is then inserted longitudinally between the leg members 8 and 9 and then pushed into its most downward position so that the edge of the V-shaped projection 12 of the jig member 10 engages the workpiece 23. By moving the jig member 10 into an abutment position relative to the flanges 10' of the leg members 9 the bore 13 of the jig member 10 is automatically aligned with the bore 3 of the base block 1. A bushing 14 is then inserted into the bore 13 of the jig member 10, the inner bore of the bushing 14 being chosen in accordance with the drill bit 16 to be inserted into said bushing 14. In this position the drill in operation can now be performed and upon termination theerof the drill bit 16 is removed and upon lifting of the jig member 10 the workpiece 23 may be likewise removed and a new workpiece inserted for a new operation.

While I have disclosed one embodiment of the present invention, it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

We claim:

1. In a jig in combination, a base block having a groove disposed longitudinally on its top face, said base block having end faces and side faces, a shoulder plate secured to and extending along each of said side faces of said base block, said shoulder plate projecting upwardly for at least a portion of its length above said side faces of the base block and said upwardly projecting portions of said shoulder plates being bent inwardly toward each other to provide resilient retaining means, a jig member retained in a plurality of vertical positions by the resiliency of said shoulder plates, said jig member being adapted to secure a rod to be drilled between said base block and said jig member, the latter having a vertically disposed first bore extending therethrough adapted to receive selectively a bushing of predetermined inner diameter in accordance with a drill bit to be used and the said base block having a vertically disposed second bore, and means for alignment of said first and second bores in order to permit of drilling a hole through said rod.

2. The jig, as set forth in claim 1, wherein said jig member has a longitudinally disposed projection, the latter being arranged selectively opposite said groove in one of its operative positions and remote from said groove in the other of its operative positions.

3. In a jig in combination, a base block having a groove disposed longitudinally on its top face, said base block having end faces and side faces, a shoulder plate secured 4 to and extending along each of said side faces of said base block, each of said shoulder plates having upper portions bent inwardly towards the other of said shoulder plates to provide resilient retaining means, a jig member having a longitudinally disposed projection arranged selectively opposite said groove of said base block in one of its operative positions and remote from said groove in the other of its operative positions and retained in a plurality of vertical positions by the resiliency of said projections of the shoulder plates, said jig member being adapted to secure a rod to be drilled between said base block and said jig member, the latter having a vertically disposed first bore extending therethrough adapted to receive selectively a bushing of predetermined inner diameter in accordance with a drill bit to be used and the said base block having a vertically disposed second bore, and one end of each of said shoulder plates having a flanged portion extending towards the other of said shoulder plates, said flanged portions operating as abutment means for the said jig member, thereby providing axial alignment of said first and second bores.

4. The jig, as set forth in claim 1, wherein said second bore of said base block leads into a counter-bore of an inner diameter complementary to the outer diameter of said bushing.

References Cited in the file of this patent UNITED STATES PATENTS 709,873 Cobb et al Sept. 30, 1902 1,093,029 Bowen Apr. 14, 1914 1,401,262 Kranz Dec. 27, 1921 1,535,570 Bryant Apr. 28, 1925 2,430,025 Mattias et a1. Nov. 4, 1947 OTHER REFERENCES Jig Clamps with Pressure, Tool Engineer, p. 45, September 1950. 

